WindowManager/Gestures: Use pan backend

Author: leolost2605

src/InternalUtils.vala

@@ -336,5 +336,14 @@ namespace Gala {
                 return { 0, 0, (int) screen_width, (int) screen_height };
             }
         }
+
+        public static float travel_distance_from_primary (Meta.Display display, Clutter.Orientation orientation) {
+            var geom = display.get_monitor_geometry (display.get_primary_monitor ());
+            if (orientation == HORIZONTAL) {
+                return geom.width;
+            } else {
+                return geom.height;
+            }
+        }
     }
 }

src/WindowManager.vala

@@ -185,6 +185,9 @@ namespace Gala {
             screensaver.active_changed.connect (update_input_area);
 
             stage = display.get_stage () as Clutter.Stage;
+
+            gesture_tracker.enable_pan (this, stage, () => InternalUtils.travel_distance_from_primary (get_display (), HORIZONTAL));
+
             var background_settings = new GLib.Settings ("org.gnome.desktop.background");
             var color = background_settings.get_string ("primary-color");
             stage.background_color = Clutter.Color.from_string (color);